Precautiuos yes, but for good reason, as you can imagine. Glad to hear you have been running 15 degrees and 91 octane successfully! Nice to see more data on these engines....
*Somewhat off-topic: Hey Barnoun, have you or do you plan to dyno your car anytime soon? Would be interesting to see what the 15 degree timing is doing over say, the 12. I had a SOTP difference when I first bumped the timing. It was set at 6 degrees from the factory! Needless to say, it freed up a few ponies.
